Thermo-electric alarm.



J. E. PAUL & J. M. STEWART.

- THERMO ELECTRIC ALARM.

APPLICATION FILED NOV. 30, 1906. RENEWED OUT. 8, 1908.

Patented Jan. 12, 1909.

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J. E. PAUL & J. M. STEWART. THERMO ELECTRIC ALARM. APPLICATION FILED NOV. so, 1906. nmmwgn 00w. 3, 190a.

909,8 1 8. Patent an. 12, 1909. S-BHEBT 2.

5/: \J I III II UNITED sTATEs PATENT OFFICE.

enn rAur. nn JAMES M. STEWART, or DENVER, COLORADO, Assrcnons or enamel) o GEORGE w. DOLEZAL, or DENVER, .coLonADo.

THERMO-ELEGTRIC ALARM.

Application filed November 30, 1906, Serial No.

To all whom 'it may concern:

Be it known that we, JOHN E. PAUL and JAMES M. STEWART, both citizens of the figures of reference marked thereon, which form a part of specification.

(3m: 'inventien relates to improvements in thermoelectric alarms or means for antomatically making and breaking an electric circuit by the variation of the temperature in the vicinity of the instrument. The device may of course be employed wherever a circuit is to be made or broken at predetermined temperatures.

The main feature of our improved device consists of a closed container or receptacle, the said receptacle being sealed with the air therein at any desired'temperature. One side of this container or receptacle, consists of a flexible. diaphragm preferably composed of metal, the said diaphragm being actuated by the expansion or contraction of the air within the container. For instance if the container is sealed with the air comparatively cool, the diaphragm will protrude inwardly. Now as the temperature rises the expansion of the air will force the diaphragm outwardly. This movement is suflicient to act to make or break an electrical circuit. For instance as the temperature rises sufficiently to expand the air to force the diaphragm outwardly, an arm may be moved to break one circuit and close another circuit, the latter being a signaling circuit. On the other hand if it is desired to give a signal to indicate an abnormal low temperature, the container may 'be sealed with the air at a temperature sufficiently to hold the diaphragm at its outward limit of movement, in which event, when the surrounding temperature reaches a limit too low for safety, the air will contract sufii- Speciflcation of Letters Patent.

345,737. Renewed October 8, 1908. Serial No. 456,769.

Patented. Jan. 12, 1909.

ciently to cause the diaphragm to move inwardly, and this movement may be suflicient to actuate a circuit making or breaking device as the case may be. Provision may be made for regulating the tension of the diaphragm in any suitable manner and by means of the tension device the diaphragm may be held against movement except when a predetermined degree has been reached.

The invention will be fully understood by reference to the accompanying drawing in which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a side elevation of the device shown artly in section. F is a s l i -W ins h cut in "di-iferen-t relative positions. Fig. :3 is a detail view of a part of the device shown on a larger scale. Fig. 4 is a top plan view of the instrument illustrating two circuits, one containing an incandescent light and another a signaling bell. Fig. 5 is a sectional view of a container provided with tension means for controlling the diaphragm. This may be said to be a section taken on the line 5+5 Fig. 6 Fig. 6 is a section taken at right angles to the section shown in Fig. 5. Fig. 7 is an underneath view of the construction shown in Figs. 5 and 6.

' The same reference characters indicate the same parts in allthe views.

Let'the numeral 5 designate a container or closed receptacle having a flexible diaphragm 6 on'one side. This container or receptacle may be composed of any suitable material, but is preferably composed of metal or other suitable non-combustible material. The receptacle is mounted on suitable supports 7 secured to a base 8. by means of screws 9.

Referring now more especially to Figs. 1 to L inclusive, let 10 designate a trigger pivotally connected as shown at 12 with a. support 13. One arm 14 of this trigger rests upon the central part of the diaphragm 6 and as shown in Fig. l of the drawing, the diaphragm is depressed, the trigger being held in a corresponding position by .a sprint 15 connected with a tension screw 16 time A ed in a part 17. The spring acts upon a small disk 18 connected with a rod 19 arranged to telescope in a longitudinal perforation-formed in-the screw. The other arm l a tension screw 44, the construction being M of the leverls provided with a notch 14: adapted to engage a lip 21 formed upon a bar 522. This bar is pivotally mounted at 23 upon a standard 24s This bar extends on both sides of its piyot The arrn 24 on one side of the pivot is connected by means of a spring 25 to alstandarcl 2% Where- I by the tendency of the spring is to throw the bar to the position illustrated in Fig,

2. W hen the device is set or in position for use, however, as shown in Fig, 1, the trigger 10 looks the bar int-engagement with a contact 26 whereby a circuit is closed through a lamp 527. This circuit is composed of a' source of electricity 28, conductors 29, 30 and 30 the standard 24-, and the bar 22, Hence when the device is set as shown in Fig. l, the circuit is normally closed through the lamp 2?, but when the temperature rises in the vicinity of the instrument sutliciently to expand the air within the container 5 to force the diaphragm outwardly to the position shown in Fig, 2, the trigger will be actuated suliiciently to release tlre'bar 22,

when the spring 25 will serve to disengage the bar 22 from the contact 26, thus breaking the circuit through the lamp and closing the circuit through a signal bell located in a circuit and composed of a source of electricity 31, a conductor 32, a branch 30 of the conductor 80, the standard 24, the arm 2 of the bar, and a contact or standard 38:. The rise of temperature sufficient to actuate the-diaphragm and force it to the position shown in Fig. 2, is predeterm ned through-experiment or otherwise, and

is such a temperature as is considered dangerous, making it important that the signal shouldhe given. It is evident that provision may be made for closing the signaling circuit by the contraction of the air within the container, whereby the diaphragm is caused to move inwardly. In other words the abnormal high or abnormal low temperature may be indicated to the action ofour improved device.

In the form of construction shown in Figs. 5, 6 and I, the container isshown in a suspended position, The spring arm 35 is connected with an arm 36 secured to the container while" a contact 37 is mounted on a support 38 also secured to the container. This contact is in the form of an elongated ring having an opening 39 within which one extremity of a spring arm 35 is adapted to tions.

substantially the same as that of the parts 15, I6, 18 and 19 in Fig, 3. Now if the circuit is closed when the diaphragm is moved inwardly as shown in Fig. 5, and as indicated by the dotted line position of the spring arm 35, when the temperature rises sufiiciently to cause the air to force the diaphragm 6 outwardly, the circuit may be broken as shown by the full line position of the spring arm 35 in Fig, t"; The contact 37 is adjustable, since it is connected with the part 38 by a screw to passing through a slot 46 formed in the contact. By virtue of this adjustment the contact may be regulated so that the circuit may closed when the diaphragm is in either of its extreme posi- From the foregoing description the use and operation of our improved device will be readily understood. @ne of the important uses of the device may be considered for giving a signal in case of fire or when the temperature rises to the danger limit in the vicinity of the device. Assuming that the device is employed for this purpose, referring more especially to l iga'l to l inclusive,

-when the temperature rises beyond the danger limit, the air within the container will expand and force the diaphragm outwardly,

breaking the circuit in. which the lamp 2? is container provided with a flexible diaphragm adapted to be actuated by the expansion or contraction of the fluid within the container, and a suitable connection be tween the said diaphragmand the movable circuit-closing partwvhereby when the diaphragm is in one position the said movable part is held in position to close one circuit, while when the diaphragm is in the opposite position, the said movable part is caused to move into position to break one circuitand close the other circuit.

2. In a thermoelectric alarm, the com bination with two circuits, signaling devices located in the respective circuits, and a movable device arranged to make or break the said circuits alternately, of a sealed fluid container' provided with a flexible diaphragm adapted to be actuated by the expansion or contraction of the fluid within the container, and a suitable connection between the said diaphragm and the movable In testimony whereof we aflix our signaoificuit-elosing part whereby WhQli she dgiitures in presence of two "witnesses.

p m m is in one position -the sai move e part i locked in posiiion to close one circuit, JOHN PAUL "While when the diaphragm is in the opposite JAMES STEWART position the said movable part is released Witnesses: and allowed to move into position to break A J: UBRIEN,

- one circuit and close the, other circuit. DENA NELsoN. 

